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FIXED ASSETS (Tables)
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of fixed assets summarized by major category
Fixed assets, summarized by major category, consist of the following (in thousands):
 
June 30,
 
December 31,
 
2017
 
2016
Machinery and laboratory equipment
$
35,224

 
$
34,309

Leasehold improvements
34,327

 
33,787

Computer equipment and software
7,298

 
5,623

Office furniture and equipment
1,603

 
1,606

Construction in progress
67,443

 
63,201

        Total
145,895

 
138,526

Less: accumulated depreciation
(42,656
)
 
(37,510
)
        Fixed assets, net
$
103,239

 
$
101,016